Remove gears to replace seals on a weka dk12 core drill

Dear Fred,

Please go to Replacement Parts in the link provided below. Too replace and remove your drill chuck on a cordless drill.

How to Remove Drill Chuck

Fare Well

Frequently the problem for this is a plastic ring that has three pins in it. Normally the pins break through the bottom of the ring.
You need to take covers off. Strip SDS chuck. Remove plastic cap from end of drill then remove large internal retaining ring. Tap end of drill with mallet and eventually the tool holder will come out.
At the bottom of the tool holder there is a thin O ring (all this does is keeps a plastic gear and springs on the tool holder.) Remove this ring gear and springs can now be removed. You should now see the plastic ring (approx. 30mm long) Examine ring and pins, probably need to replace ring. This is usually the cause of not hammering, I have found changing seals works for weak hammering. Although having stripped the drill to this point I normally change the O rings on the hammer and piston. Rebuild is reverse of stripping be careful with the thin O ring not to snap it.

This is a big job and you will need a manual for guidance. Basically remove the gear box ( auto or manual) remove the clutch assembly or flex plate . Remove the flywheel. Use a seal remover tool or drill a small hole in the seal and inset a self tapper screw and lever out the seal. Replace with a new seal taking care to install with out damaging the seal. Replace all the removed items. As I said a big job and will take about 8 hours for a novice.

remove the timing belt and crankshaft gear.drill a small shallow hole into the steel ring of the seal.USE CAUTION DONT DAMAGE AREA AROUND AND BEHIND SEAL..you need to insert a self tapping screw into small hole you drill using pliers pull the front crankshaft seal out.when installing new seal coat new seal with grease and you need SEAL INSTALLER TOOL J35268-A.

Bad heater core you will need to replace it. About a 2 hour job, very easy to do:


Remove the HVAC module assembly. Refer to HVAC Module Assembly Replacement.
Remove the HVAC filter cover.
Remove the heater core/evaporator tube seals from the module.
Remove the heater core cover screws (1).
Remove the heater core retaining screws (1).
Remove the heater core retaining straps.
Remove the heater core.
Remove the rubber seals from the inlet/outlet pipes of the heater core.

Installation Procedure

Install rubber seals to the outlet/inlet pipes of the heater core.
Install the heater core to the module.
Install the heater core retaining straps.



Install the heater core retaining screws (1).
Install the heater core cover.



Install the heater core cover screws (1).



Install the heater core/evaporator tube seal from the module.
Install the HVAC filter cover.
Install the HVAC module assembly. Refer to HVAC Module Assembly Replacement.

Heater core is removed from inside the cabin. About a two hour job. The hardest part is removing the hoses in the engine bay.
In the cabin, remove the beauty panel under the glovebox; remove the glovebox, and move the HVAC controller. The heater housing, or cover is held with two screws, and the core is held with one screw (clamp).
Remove the HVAC module assembly. Refer to HVAC Module Assembly Replacement.
Remove the HVAC filter cover.
Remove the heater core/evaporator tube seals from the module.
Remove the heater core cover screws (1).
Remove the heater core retaining screws (1).
Remove the heater core retaining straps.
Remove the heater core.
Remove the rubber seals from the inlet/outlet pipes of the heater core.

Installation Procedure

Install rubber seals to the outlet/inlet pipes of the heater core.
Install the heater core to the module.
Install the heater core retaining straps.



Install the heater core retaining screws (1).
Install the heater core cover.



Install the heater core cover screws (1).



Install the heater core/evaporator tube seal from the module.
Install the HVAC filter cover.
Install the HVAC module assembly. Refer to HVAC Module Assembly Replacement.

This is the best that I can do for you, hope this works

you have to disassemble the tool completely. Remove chuck, remove battery, remove all screws holding body parts together, remove one side of body. Now you can see motor and gear box. Pull out both of them and twist gearbox a bit (just few degrees or millimeters) if it goes, then just pull gear away from the motor. Be carefull, some gear parts may drop of, so hold gearbox down and motor up. Juraj

find a schematic for your tool and it will show you how things go together. you may need a press to press it out or a gear puller. if the schematic shows spendal and gear apart you should be able to remove the gear. if it shows all one piece, then you replace the whole thing.

separate the housing and remove the gear assembly and chuck ....see if you can use a open end wrench on the shaft and locking pliers on the chuck body